Firefox‘s tabbed browsing really irks me sometimes. I was most of the way through composing a pithy (no, I don’t have a lisp) entry, when I try to close an unwanted tab with the [X] icon. Kaboom! My entry’s gone. Seems I closed the wrong tab.
With great power comes great confusability, I suppose.
Funny, I was bitten a few days ago too. I figured it would close the current open tab…not.